Chemical Reaction

• Physical change- involves

  only a change in the appearance but not in composition of the material.
• Chemical change- involves not only change the appearance of the material but also its

  composition.
• A chemical reaction is usually accompanied by one or combination
• Chemical reaction is a process in which one or more substances are converted

  to one or more different substances. In other words, chemical reaction is the process

  where a material is transformed into a new one, possessing a new composition.
• A chemical- equation is a symbolic representation of a chemical reaction.
• There are two parts of

  a chemical equation, the reactants and the products.
• Reactants- are the substances

  before reaction and written on the left side of the chemical equation.
• Products- are the substances resulting from the reaction and presented at the right side of the

  chemical equation.
• "+" - indicates that the substances are added or mixed.
• "→"

  means “yields”, “makes”, “produces”, “forms”

  separates the reactants from the products.
• "↓"

  means that a precipitate is formed.
• "↑"

  indicates that a gas has evolved.
• (s)

  designates that the reactants or products are in solid form
• (l)

  designates that the reactants or products are in liquid form.
• (g)

  designates that the reactants or products are in gas form.
• (aq)

  designates an aqueous solution; the substance is dissolved

  in water
• (triangle)

  Indicates that heat is supplied.
• TYPES of CHEMICAL REACTION

  • Combination or Synthesis
  • Decomposition
  • Single Displacement (Replacement)
  • Double Displacement (Replacement)
  • Combustion (Burning) Reaction
  • Acid-Base Reaction or Neutralization Reaction
• Combination or Synthesis - a reaction when two or more elements combine to form a single product.

  
• Decomposition - a single reactant breaks down into simpler ones. It is the opposite of combination reaction.

  
• Single Displacement (Replacement) – A substance; it can be an element or a compound; capable of replacing one of the atoms of a given compound

  
• Double Displacement (Replacement) – a reaction in which ions get exchanged between two reactants, resulting to the formation of a new compound

  
• Combustion (Burning) Reaction – a reaction wherein oxygen gas combines with a hydrocarbon; a compound containing carbon and hydrogen atoms; forming carbon dioxide and water as the products.

  
• Acid-Base Reaction or Neutralization Reaction - special kind of double displacement reaction that takes place when an acid and a base react. In general, the products of this reaction are salt and water.